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We demonstrate, through experimental results and supporting numerical simulations, the optimum conditions to generate an optical comb via gain-switching of a single-mode DFB semiconductor laser. The DFB laser is biased appropriately and gain-switched with a large amplitude sinusoidal current, modulating the gain that is sufficient to turn the laser ON and OFF. This results in the generation of a train...
We present simulation results of the nonlinear dynamics of externally-injected, gain-switched laser comb sources. We implement a fully-stochastic laser model and highlight the trade-off between the number of comb lines and the noise properties of the comb.
Optical transport networks will soon require channel data rates in excess of 100 Gb/s in order to continue to meet the demand for bandwidth. Bandwidth flexible optical networks, based on flex-grid ROADMs, have been proposed in the literature to support 400 Gb/s and 1 Tb/s super channels [1]. In such systems, techniques including coherent optical OFDM and Nyquist WDM transmission [2] may be employed...
The authors present a multi-carrier transmitter based on a gain switched laser employed in a next generation access network. The simple, robust and cost efficient direct modulation based comb generation technique offers closely spaced coherent channels. Each of the channels is imposed with 2.5 Gbaud data using QPSK and 16-QAM formats. The authors also present a performance comparison between the commonly...
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